Machine for cutting the threads on bolts



(No Model.) 5 Sheets-Sheet 1.

W. S. HALSEY. MACHINE FOR OUTTING THE THREADS ON BOLTS. No. 380,887. Patented Apr. 10,1888.

144755555- /7 1 57/02: 5 mafia. y 2 5v PholoLKhngraphnr, Waihinglum D..C.

(No Model.) 5 Sheets-Sheet 2.

. v W. S. HALSEY.

MACHINE FOR GUTTING THE THREADS ON BOLTS.

Patented Apr. 10, 1888.

mammal.

W. S. HAL'SEY. MACHINE FOR CUTTING-THE THREADS 0N BOLTS.

Pat-entedApr. 10, 1888.

5 Sheets--Sheet 3.

N. PETERS, Phnlo-Ll'lwgraphcn Wanhingtan. D 0.

I 5 Sheets--Sheefn 4. W. s; HALSEY. v MACHINE FOR CUTTING THE THREADS 0N BOLTS- No. 380,887. Patented Apr. 10, 1888.

(No Model.)

5 Sheets-Sheet 5. W. S. HALSEY. MACHINE FOR CUTTING THE THREADS 0N BOLTS.

(No Model.)

No. 380,887. Patented Apr. 10. 1888,

UNITED STATES PATENT OFFICE.

\VILLIAM S. HALSEY, OF BRIDGEPORT, CONNECTICUT.

MACHINE FOR CUT'l'ING THE THREADS ON BOLTS.

SPECIFICATION forming part of Letters Patent No. 380,887, dated April 10, 1888. Application filed September 7, 1887. Serial No. 249,027. (No model.)

To CLZZ whom i0 may concern:

Be it known that I, WILLIAM S. HALsEY, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Machines for Cutting Screw-Threads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the class of machines illustrated in Patent No. 147,462, dated February 10, 1874, and has for its objects to greatly increase the production of the machine and to simplify and improve its general construction, the tail-stock being made both adjustable and removable to adapt the machine for all classes of work, and the parts being so constructed and organized that either rough or finished work may be produced without change of parts by adjustments so simple that they may be accomplished in a moments time.

In practice, having once adjusted the cutter head,no change is required for different lengths of bolts unless the length of the threaded por tion is changed.

By providing two pinions, one in engage ment with each counter-rod, I make all the strain central, and thus reduce the wear of parts to the minimum; and, furthermore, by a novel construction and arrangement of parts I provide that there shall be no waste of oil in -use, thus avoiding what has heretofore been an important element of cost in the production of threaded screws.

With these ends in view I have devised the simple and novel construction of which the following description, in connection with the accompanying drawings, is a specification, numbers being used to denotethe severalparts.

Figure 1 is a side elevation of the entire ma chine; Fig. 2, a central longitudinal section, a portion of the operative parts being in elevation; Fig. 3, a plan view of the operative parts, which are shown in position to receive a blank, the position of the parts in Figs. 1, 2, and 3 being the same, the camgroove being in position to throw the cutters to the opened position; Fig. 4, a similar view, showing the position of the parts after a thread has been cut, the cam-groove being shown in such position as to leave the cutters in the operative position; Fig. 5, a similar view, the cutterhead having made a partial revolution, the parts being ready for the backward movement of the tail-stock; Fig. 6, a front elevation of the cutter-head, a portion being in section to show the manner in which oil is conveyed to the cutters; Fig. 6, a detail sectional view on the line 00min Fig. 6; Fig. 6 a detail sectional view on the line 3 y in Fig.6; Fig. ,7, a central section of the cutter-head; Fig. 8, a detail sectional view illustrating the construction of the cutter-operating lever, the sliding block, and the latch; Fig. 9, a front elevation of the clamping mechanism detached, the handle be ing removed; Fig. 10, a detail section on the line as m in Fig. 9, illustrating the construction of the device for holding the jaw-operating screw from moving up or down; and Fig. 11 is a cross-section illustrating the construction of the tail-stock, Figs. 6 to 11, inclusive, being on an enlarged scale.

1 denotes the framework, which may be of the usual or any preferred construction, and 2 the bed of the machine.

3 denotes the shaft, to which power is ap plied by belts (not shown) running over conepulley 4, and 5 a pinion on said shaft meshing with gear-wheel 6 on the cutter-head shaft. Shaft 3 may be omitted, if preferred, and conepulley 4 placed directly upon the cutter-head shaft and connected thereto by suit-able clutch mechanism. This,-being an obvious mechanical expedient, has not been illustrated in the drawings.

8 denotes a sliding bed adapted. to move in ways in bed 2.

'9 denotes the tail-stock as a whole, which is adjustably secured to the sliding bed, as

will presently be'more fully explained, and 10 clamping mechanism as a whole, also adj ustable at the inner end of the sliding bed. The shaft 11 of the cutter-head isjournaled in suitable hearings in the frame-work, as clearly shown'in Fig. 2.

12 denotes the cutter-head, which I make integral with the shaft. In the back of the cutt-er-head is a circular recess, 13, adapted to receive a ring, 14., which turns with shaft 11,

in addition to which it has a forward and backward movement longitudinally of the shaft.

denotes the dies or cutters, which reciprocate in recesses (see dotted lines, Fig. 6) in the face of the cutter-head, and are held in position by a ring, 16, secured by screws 17, or in any suitable manner.'

18 (see Figs. 6 and 7) denotes the cutter-operating slides, the under sides of which are beveled to engage corresponding bevels at the outer ends of the cutters, the parts being held together by tongues and grooves .or in any suitablemanner. (Notshowu) Theinnerends of the slides are secured to ring 14, so that as the latter moves outward-that is, toward the right in Fig. 7the cutters are forced inward, and when the ring is moved inward-that is, toward the leftthe cutters are thrown out ward out of operative position.

I have not d'eemed it necessary to illustrate the bevels and the tongues and grooves at the outer ends of the cutters and forward ends of the cutter-operating slides, as the construction is old and well known.

19 denotes a disk on shaft 11, which is provided with a cam-groove, 20, and with stopteeth 21. In practice I ordinarily use four stop-teeth, in order that I may be enabled to open or close the cutters by a quarter-revolution of the cutter-head, thus etfecting a great saving of time in the aggregate. The disk is loose upon the shaft, and is held in position by a nut, 22, which in turn is locked by ajamnut, 23. In practice the inner face of disk 19 is usually provided with a recess to receive nut 22, and the latter is provided with a recess to receive the inner side of a frictioncollar,-24, which is secured to the inner face of the disk by screws or in any suitable manner. This frictioucollaris screwed up tightly enough to insure the rotation of disk 19 with the shaft until it is stopped by the engagement of tone of the stop-teeth, as will presently be explained.

l8 denotes bars connected to ring 14, and provided at their opposite ends with rollers 25, which engage the cam-groove in disk 19, whereby the cutters are moved into and out of operative position.

The operation of this portion of the ma chine and the functions of the stop-teeth and friction-collar will presently be more fully explained.

Turning now to Fig. 11, the novel features of the tail-stock will be found clearly illustrated.

26 denotes the body of the tail-stock, 27 the spindle, having the usual point, and 28a handwheel by which it is operated, these parts being of ordinary or any preferred construction. The body of the tail-stock rests upon overhanging portions 29 of the sliding bed and is adapted to slideindependently of said bed.

30 is an opening in the body of the tailstoclgwhich is adapted to receive a block, 31.

32 is a cross piece under overhangingportions 29 of the sliding bed, which spans the opening between them. This cross-pieee is secured to the block by a screw, 33.

In order to give additional stability to the parts, the lower end of the block is reduced, as at 34, to adapt it to pass within a circular flange, 35, on the cross-piece,which passes up into the opening in the block, as clearly shown in Fig. 11.

36 is a shaft passing transversely through the body, and having an eccentric, 37, engaging an opening in the block.

38 is a hand-lever for convenience in operating the eccentric. Suppose that it is desired toadjustthetailstock. Theeccentrieisthrown to the reverse ofthe position shown in Fig. 11, which allows the cross-piece to drop down sufficiently, so that it will not bind against overhanging portions 29. The tailstock may then be moved to the desired position,and when properly adjusted is locked by turning the eccentric back to the position shown in Fig. 11. Should it be desired to remove the tail-stock, the cross-piece is lowered, as before, by turning the eccentric. The operator then passes his hand under the body and turns the crosspiece to a position substantially at right angles to that shown in Fig. 11, so that the crosspiece lies longitudinally of the opening between the overhanging portions. This permits the tail-stock to be lifted off without disturbing otherportions of-the machine-as, for example, when it is desired to cut a screwthread at the end of a tie-rod or a long bolt.

At the forward end of the sliding bed is a dovetail projection, 39, which engages a corresponding dovetail groove in a block, 40, which carries the clamping mechanism,which is designated as a whole by 10, andillustrated in detail in Figs. 9 and 10.

41 denotes the jawcarriers, and 42 thejaws, secured thereto by screws or in any suitable manner. Block is provided with a dove tail groove, 43, and the jaw-carriers with corresponding dovetail projections adapted to engage therewith, as clearly shown in Fig. 10. The jaw-carriers are provided with vertical openings having respectively right and left screw-threads.

44 is a screw reverse-threaded at opposite ends to engage threads in the jawcarriers, so that'thelatter are both moved toward or away from each other by the rotation of the screw, thus opening or closing the jaws. The upper end of the screw passes through a cap-piece, 45, at the top of the block and is squared to receivea suitable handle. (See Figs. 9 and 2.)

46 denotes an enlargement having a circular groove, 47, midway between the reverse threads.

48 (see Fig. 10) is a slide having a point adapted to engage the groove in which it rests ordinarily.

49 is asp ring. preferably recessed within the slide, which acts to force the latter outward and hold the point in engagement with the groove, and 50 isa set-screw which passes through the block from the outside and which engages the slide to lock the point of the latter in engagement with the groove, as is clearly shown, the

finished work, the bolt is centered between the. spindles. It is then clamped to hold it against rotation by closing thejaws upon itin v the manner already explained.

In order to compensate for possible irregularities in the outline of the bolt or piece of.

metal that is to be threaded, I retract setscrew and screw-pin 51. The retraction of set-screw 50 leaves slide48 held in engagement with groove 17 by the spring alone, so that if vertical displacement of the jaws is required in looking them upon the bolt the screw, and with it the jaws, will move freely up and down as may be required, the point of the slide being forced out of the groove against the power of the spring. The retraction of screw-pin 51 leaves block 40, and with it the entire clamping mechanism, free to move laterally should lateral movement of thejaws be necessary in order to grasp the bolt firmly, as in a vise.

When the machine is used to cut a thread upon long bolts or tierods, or upon what is termed rough work, the spindles are not used. The tail-stock may be either moved out of the way or, in case of long bolts, removed from the machine. The cutter-head spindle in this case would of course move forward in the usual manner, which will presently be explained, but would havenothing to do with holding the bolt. In this class of work setscrew 50 and screw-pin 51 are both turned in tight, thus locking the screw andjaws against vertical displacement and the block,and with it the entire clamping mechanism,against lateral displacement. In this case the bolt, not being held between centers-i. e., the points of the spindle--is brought to a central position by thejaws, the bolt being firmly clamped in posi' tion no matter how irregular its outline may. be,within reasonable limits, of course. On the contrary, in the finer grades of work, when the bolt is centered between the spindles, it is necessary that the jaws should have both lateral and vertical movement to compensate for irregularities in the outlines of the bolts. The outer end of the cutter-head spindle is attached to a cross-piece, 53, the ends of which are attached to connterrods bet on opposite sides of the machine. The counterrods are held in position by guides 55 upon the frame-worlgthrough which they slide freely, and lugs 56, under which they pass and which hold them from being sprung upward when the machine is on at its retracted position.

heavy work. The opposite ends of the counterrods pass through clamps 57 upon the sliding bed, in which they are firmly locked by screws having hand-levers 58. The under sides of the counter-rods are provided with rack-teeth 59, which are engaged by pinions 60 on shaft 61,

journaled in the frame-work. The usual handlevers 62 are provided for convenience in rotating the shaft to move the counterrods, sliding bed, cutter-head, and tail-stock spindles, &c., in either direction.

By providing counter rods on opposite sides of the machine and a pinion to actuate each rod I insure that the line of strain shall be central, so that there shall be no springing of the parts when the machine is used upon heavy work.

63 denotes a lever pivoted to the frame-work just forward of cone-pulley 4. This lever is provided with a notch, 6-1, at its forward end and with engagingsurfaces 65 and 66, the

former of which is adapted to engage the stopteeth and the latter to engage cams 6 7 on the cutter-head, for purposes presently to be explained. By pivoting lever 63 forward of the cone-pulley I am enabled to place the latter upon the cutter-head shaft, if preferred.

68 denotes a spring,the action of which is to throw lever 63 inward to its operative position.

69 is a sliding block lying in a recess, 70, in the frame-work, or, preferably, for convenience in construction, in a block, 71, which is itself let into the frame-work and secured there.

72 is a latch pivoted to the sliding block and provided with a notch, 73, and a stump, 74, upon its upper side.

75 is a spring recessed in the inner end of the sliding block,the action of which is to throw latch 72 outward-i. 6., toward the front.

76 is a plate covering the recess and spring 75, and 77 a spring lying in recess 70 and bearing against theend of the recess and plate 76, its action being to force the sliding block, and with it latch 72,outwardi. 6., toward the right.

78 (see Fig. 1) is a gravitylatch pivoted to the side of the frame-work, the upper end of which is provided with a surface, 79, which is adapted to be engaged by the forward end of latch 72,and with a projection, 80, adapted to engage notch 6t in lever 63 to lock the latter 81 denotes adog, which is adj ustablysecured to the counter-rod on that side of the machinei. 6., the front as viewed-by a set screw, or in any suitable manner. The adjust ment of this dog upon the counter-rod determines the length of thread to be out upon the bolt, the length of thread cut being equal to the distance between the dog and notch 73 in IOU latch 72 when the latter is forced forward to The operation of the several parts described 7 will now be fully explained. Suppose that the machine is to be used upon what is termed finished work. Dog 81 is adjusted at a distance from notch 73, at its farthest position toward the left, equal to the length of thread that is to be out upon the bolt. This may be determined by passing the screw into the cutter-head with the cutters retracted, or by meas urement. The screws operated by hand-levers 58 are then turned outward sufficently to loosen clamps 57, and the sliding carriage is moved outward-that is, toward the right-until the distance between the cutter-head and tail-stock spindle-points is approximately equal to the length of'the bolt, the distance being left, of course, slightly greater than the length of the bolt, and the final adjustment made by turning up the tail-stock spindle in the usual manner. The parts will now be in the position shown in Fig. 3, and the cutters will be retracted, it being understood of course that power is applied and that the cutter-head, cutters, &c., are in continuous rotation, the cutter-head spindle being stationary as regards rotary movement. The operator then lifts the lower end of gravity-latch 7 8, which disengages projection 80 from the notch in lever .63 and allows spring 68 to throw the latter inward. Engaging surface 66 is of course pressed against the surface of disk 19 and is engaged by the next one of stop-teeth 21 that reaches it. This instantly stops the rotation of disk 19, which is connected to the shaft of the cutter head by friction collar 24 only. This friction-collar is drawn up against nut 22 tight enough to insure the rotation of the disk with the cutter'head spindle until the disk is positively locked by the engagement of lever 63 with one of the stop-teeth. The instant the rotation of the disk is stopped rollers 25 on the die or cutter operating slides ride up the inclines ofcam-groove20, the action of which is to force theslides toward the right, which forces j the dies or cutters inward to their operative position. It should be understood that the disk in which the cam-groove is cut is at this time stationary, and that bars 18, carrying the camrollers, are at all times carried around with the cutter head. The instant the cutters have reached their operative positions one of the cams 67 on the cutter-head will engage surface 66 of lever 63 and throw the latter outward to its retracted position against the power of spring 68. The instant lever 63 reaches this positionthat is, as in Fig. 3, in which one of the cams is shown as in engagement with the lever-the projection upon the gravity-latch will move upward into notch 64 and lock the lever at its retracted position. The outward movement of the lever of course releases the stop-tooth and permits disk 19 to rotate again with the shaft of the cutter-head, so that the cutters remain at their operative position. As soon as the cutters are in position, the feeding forward of the bolt is commenced by the movement of hand-levers 62. In cutting fine threads the feed is controlled entirely by the movement of these levers, which act through shaft 61 and pinions to move the counter-rods and the parts carried thereby toward the left. In cutting coarse threads, however, as soon as the cutters have taken hold upon the metal the device may be left to feed itself without danger of stripping the threads, it being of course understood that the rotation of the cutters around the bolt in the act of cutting the thread must necessarily draw the bolt inward. The operation of cutting the thread will continue until an instant after the parts have reached the position shown in Fig. 1. In this figure disk 19 is shown as locked by the engagement of one of the stopteeth with lever 63. The action of the different parts ofthe die-operating mechanism between the position shown in Fig. 3 and that in Fig. 4c is as follows: In'the movement of dog 81 toward the left as the thread was being out upon the bolt the dog first came in contact with notch 73 in latch 72 and moved the latch and sliding block 69 toward the left. The front end of the latch next engaged surface 79 of gravity-latch 78 and tilted projection 80 toward theleft until it had passed to a plane below the under surface of lever 63, thus releasing the latter and allowing spring 68 to throw it inward. As lever 63 swung inward, horn 82 at the outer end thereof passed over the projection on the swinging latch, thus holding the latter out to operative position. same instant the horn came in contact with stump 74. on latch 72, carrying the latch inward and disengaging it from the dog, this being the exact position of the parts in Fig. 4, the rotation of disk 19 having been stopped by the engagement of one of the stopteeth with lever 63. As soon as the latch is forced inward and the dog disengaged from notch 73, spring 70 acts to throw the sliding block back to the position shown in Figs. 3 and 5, the latch, however, being for the moment held out of operative position by contact with the dog, as clearly shown in Fig. 5. Thisisin order that there shall be no possibility of the latch getting intoa position that will obstruct the movement of the gravity-latch to lock lever 63 at itsretracted position. The rotation of the cutterhead continuing, rollers 25 upon bars 18 of course travel up the inclines in the cam-groove and act to throw the cutters to the retracted position again. At this instant the cam 67, which appears at the top in Fig. 4, will have made a quarter-revolution-that is, to a position corresponding with that in Fig. 3, and will engage surface 66 of lever 63, throwing the lever outward and disengaging surface from the stop-tooth. The instant lever 63 reaches its retracted position, projection 80 on the gravity-latch moves up into the notch in lever 63, thus locking the latter in its retracted position and permitting disk 19 to rotate again with the cutter-head, leaving the cutters in the retracted'position. As already stated, the cutters and the mode of operating them are not of my invention. I have there- At the fore not deemed it necessary to illustrate this portion of the machine in detail. The parts are now exactly in the position shown in Fig. 5. The operator now, by means of hand-levers 62 and the shaft and pinions, moves the counter-rods and the parts carried thereby-that is, the sliding bed, cutter'head, and tail-stock spindles, and the clamping mechanism-toward the right. The threadedbolt is then removed,-and a new bolt may be adjusted between the spindles, as before. The parts are now in the position shown in Fig. 3, latch 72 having been moved into operative position by spring as soon as the dog was moved toward the right. The operator now tilts-the gravitylateh by hand, moving the upper end thereof toward the left, handle 83 being provided for convenience in operation. As soon as projection upon the gravitylatch has passed below the under surface of lever 63, spring 68 throws the latter inward again, causing it to engage one of the stop-teeth, which stops the rotation of disk 19, causes rollers 25 to move up the inclines (toward the right) in the groove in disk 19, thus moving reciprocating ring 14 toward the right and throwing the cutters again to their operative position. At the instant this is accomplished one of the cams 67 throws lever 63 out again, disengaging the stop-tooth and leaving disk 19 free to rotate again with the cutterhead shaft. As soon as the lever is thrown out by cam 67, projection 80 on the gravity-latch moves into notch 64 in the lever, locking it in its retracted position, and consequently leaving the cutters in their operative position, as already described. It will thus be seen that with the exception of the movements of the counter-rods and the parts carried thereby, which is accomplished by manipulation of hand-levers 62 and the single movement of the gravity-latch to disengage lever 63 and throw the cutters into operative position, all movements of the machine are automatic. When the machine is used upon rough work, the operation is precisely the same, except that the use of the cutter-head and tail-stock spindles is dispensed with.

One of the important details of construction of my improved. machine is that I'provide four stop-teeth upon disk 19 and two disengagingcams upon the cutter-head. By this means I secure either the opening or closing of the outters in a quarter-revolution or less of the cutter-head, thus greatly increasing the production of the machine. 7

Turning now to Figs. 2, 6, and 7, I will describe my novel automatic oiling mechanism.

84 denotes an oiling-groove on the outer edge of the cutter-head, 85 inclines in line with each other on opposite sides of the groove, and 86 a cap covering this groove, the opposite edges of the cap being beveled to accurately lit the inclines on opposite sides of the groove, so that a tight joint is formed. The cap is stationary and is held in close contact with the inclines by a ring, 87, which is screwed on at the front of the cutter-head and preferably locked in position by set-screws. This ring in use is screwed up tight enough to force the cap backward, insuringa tight joint between the inclines and the cap, at the same time leaving the cutter-head, and of course the ring, free to rotate without unnecessary frietion between the cutter-head and ring and the cap. Channels 88, leading from groove 84 inward to the opening in the end of the cutterhead in which the cutters act, supply oil freely to the cutters when the machine is in operation. Oil is supplied to the groove through a pi pe,89,leading from a sump or reservoir, 90.

91 denotes a pump for forcing oil from sump through pipe 89 to the groovein the cutterhead. The piston 92 of this pump is actuated by a rod, 93, eccentrically connected to the inner end ofpower-shaft 3. As oil flows down from the cutter-head it drops upon a screen, 94, the meshes of which are sufficiently fine to retain the cuttings and to allow the oil to drip through into the upper sump, 95. This sump is made dishshaped, so that dust and fine particles of metal which pass through the screen with the oil will settle at the bottom. The overflow of oil passes through an opening, 96, at the edge and drops down into sump 90. From sump 90 the oil passes through an opening, 97, into the cylinder of the pump.

98 is an opening from the cylinder into pipe 89. This opening being below opening 97, it follows that at each reciprocation of the piston a certain amount of oil is forced into pipe 89, thence into groove 84 in the edge of the cutterhead, the groove being kept continually full, thus forcing a continuous supply of oil through channels 88 to the cutters.

It will of course be understood that I do not confine myself to exact details of construction having four stopteeth, in combination with lever 63, gravity-latch 78, latch 72, and dog 81. 2. The cutter-head having cams 67, the cutters, disk 19, having; stop-teeth .and a camgroove, the cutter-operating slides, ring 14, and bars having rollers engaging the camgroove, in combination with lever 63, gravitylatch 78, latch 72, and dog 81.

3. The combination,with the cutters,cutteroperating slides, sliding ring, and bars having rollers 25, of disk 19, having a cam-groove with whichthe rollers engage.

4. The-cutter-head having cams 67, the cutter-head shaft, loose disk 19, having stopteeth, anda friction-collar engagingsaid disk, in combination with a spring-actuated lever adapted to engage the stop-teeth to lock the disk 19, loose on said shaft, in combination with nut 22,engaging the shaft to hold the disk in place, and a friction-collar secured to the disk and engaging the nut, whereby the disk is caused to move with the shaft.

6. The cutter-head, cutter-head shaft, and disk 19, loose on said shaft and provided with stop-teeth, in combination with nut 22, engaging the shaft to hold the disk in place, a friction-collar engaging the nut to cause the disk to rotate with the shaft, and a lever adapted to engage the stopteeth to lock the disk against rotation, substantially as and for the purpose set forth.

7. The cutter-head having earns 67, cutterhead shaft, cutters, loose disk 19, having a cam-groove and stop-teeth, the friction-collar engaging the disk, and cutter-operating mechanism actuated from the cam-groove, in combination with spring-actuated lever 63, adapted to engage the stop-teeth, whereby the cutters are opened or closed, and to be engaged by cams 67, whereby it is disengaged from the stop-teeth, leaving the cutters at either the opened or closed position.

8. The cutter-head having cams 67, the loose disk having stop-teeth, and the friction-collar, in combination with lever 63, and a spring adapted to throw said lever inward to engage one of the stop-teeth, whereby the disk is held against rotation until the lever is thrown out by one of the cams 67.

9. The cutter-head having cams 67, the cutter-head shaft, the loose disk having stopteeth, and the cone-pulley and intermediate gearing, in combination with the friction-collar, and spring-actuated lever 63, pivoted forward ofthe cone-pulley and adapted to engage said lever and said stop-teeth.

10. The cutter-head having cams 67, the loose disk having stop-teeth, and the frictioncollar, in combination with springactuated lever 63, adapted to engage said stop-teeth and cams, and gravity-latch 78, adapted to engage lever 63, to hold it in the retracted position when thrown out by one of the cams.

engages the latch, causing it to trip the grav- Y ity-latch and permit the lever to engage one of the stop-teeth.

12. Lever 63, a spring acting to throw said lever inward, and a gravity-latch acting to hold it at its retracted position, in combination with a sliding block carrying latch 72, the counterrods, and a dog upon one of said rods which moves the latch forward and causes it to trip the gravity-latch, so that lever 63 can be thrown inward by the spring.

13. Spring-actuated lever 63, having notch 64 and horn 82, in conibinationwith gravitylatch 78, having a projection adapted to engage said notch, a spring-actuated sliding block carrying a spring-actuated latch having a notch, 73, and a stump, 74, and a reciprocating dog, 81, whereby, when said dog engages notch 73, the latch is carried forward and engages the gravity-latch, forcing thelatter out of notch 64, so that the lever can move inward, the horn then engaging stump 74:,-

which disengages notch 73 from the dog and permits the block to move backward, the horn acting at the same time to hold the gravity-latch in position.

14. The combination, with the cutter-head having cams 67, the cutters, the loose disk having stop-teeth, and spring-actuated lever 63, engaging said cams and stop-teeth, of a gravity-latch adapted to engage said notch, a spring actuated sliding block carrying a spring-actuated latch adapted to engage the gravity-latch, and a reciprocating dog adapted to engage the latch,whereby, at the predetermined time, lever 63 is released and moves inward, engaging one of the stop-teeth to open or close the cutters, one of said cams acting an instant later to disengage the lever from the stop-teeth, so that the cutters will remain at either the opened or closed position.

15. Springactuated lever 63, having notch 64 and horn 82, in combination with gravitylatch 78, having projection 80, adapted to engage said notch, spring-actuated sliding block 69, carrying spring-actuated latch 72, and a reciprocating dog which engages the latch, moves it forward with the block, and trips the gravitylatch to release lever 63.

16. Spring-actuated lever 63, having notch 64 and horn 82, and gravity-latch 78, having projection 80,adapted to engage said notch, in combination with sliding block 69, carrying spring-actuated latch 72, having notch 73 and stump 74, spring 77, and a reciprocating dog which engages the latch, moves it forward with the block, and trips the gravity-latch to re lease lever 63, which, as it moves inward, engages the stump, thereby disengaging notch 73 from the dog and allowing spring 77-to return the block and latch to their normal positions.

17. Counter-rods 54 on opposite sides of the machine and provided with rack-teeth 59, in combination with shaft 61, having hand-levers and pinions engaging both of the counter-rods, whereby the strain upon the parts in use is made central.

18. The cutter-head having oil-groove 84., inclines 85 on opposite sides thereof, and channels leading to the interior, in combination with a cap covering said groove and engaging the inclines,ring 87,for holding the cap against the inclines, and a pipe for supplying oil to the groove.

, 19. The combination, with the cutter-head having an oil-groove and channels leading to the interior, cap 86, shaft 3, and oil-sump 90, of a pipe, 89, leading from said sump to said cap, and a pump having a rod, 93, eccentric ally connected to the end of said shaft, whereby oil is supplied from the said sump to the interior of the cutter-head under pressure.

20. The combination, with the cutter-head, of a dish-shaped sump, 95, under the cutterhead to receive the waste oil, having an opening, 96, at its edge, and a screen, 94, to catch the chips, of a sump, 90, to receive the overflow, a pipe connecting said sump with the cutter-head, and a pump for forcing the oil thereto.

21. The combination, with the cutter-head, an oil-sump, 90, a pipe leading from said sump to the cutter-head, and a pump for supplying oil thereto, of a sump, 95, to receive the Waste oil, made dish-shaped to allow the dust to settle, and provided with an opening at its edge to permit the overflow to pass into sump 90, and a screen under the cutter-head to catch the chips.

22. The combination, with the cutter-head, spindle, and counter-rods, of a sliding bed,

clamps for securing said bed to the counter-- under sides, in combination with an operating-shaft having pinions engaging the rackteeth and a sliding bed having clamps to secure it to the counter-rods.

24. The combination, with the cutter-head, counter-rods,and sliding bed,of vertically and longitudinally adjustable clamping-jaws carried by the sliding bed.

25. The combination, with the sliding bed having dovetail projection 39, of block 40, engaging said projection, clamping-jaws carried by said block, and a screw-pin passing through the block and engaging the sliding bed to lock the clamping mechanism against longitudinal movement when required for certain grades of work.

26. The combination, with thejaw-carriers and screw 44, having a central enlargement, with a groove, 47, of aslide, 48, engaging said groove, a spring acting to hold the slide in engagement, and a set'screw whereby it may be locked in engagement to hold the jaw-carriers against vertical movement when required for certain grades of work.

27. Thejaws, jaw-carriers, and a screw, 44, having agroove, 47, in combination with slide 48 and set-screw 50.

28. The sliding bed and block 40, adapted to move transversely thereon, in combination with the jaws carried by screw 44, having groove 47, a slide engaging said groove, and a spring'holding it in engagement therewith, but adapted to permit the slide to move out of the groove when vertical movement of the 'jaws is required.

29. The sliding bed, block 40, adapted to move transversely thereon, and screw-pin 51, to lock it against movement when required, in combination with the jaws carried by screw 44, having groove 47, a slide engaging said groove, and a setscrew adapted to hold the slide in engagement with the groove to lock the jaws against vertical movement.

80. The jaw carriers and right and left threaded screw 44, by which they are carried, and which is provided with a central groove, in combination with a slide and a spring acting to hold it in engagement with the groove, whereby the jaw-carriers and screw are held against vertical movement until the slide is pressed out of the groove.

31. The combination, with the cutter-head and cutters, of the sliding bed, clamping mechanism carried thereby, and a setscrew,

W'ILLI AM S. HALSEY.

Witnesses:

A. M. WoosTnR,

B. E. LEE.

slide, and screw-pimwhereby said mechanism 

